ONO; more MM gain, please!

[Cobra2]

I have a diy-(X)ONO, and would really like some more gain for MM.
(stock=40dB).
For MC, there are 2 jumpers, but MM is fixed...
Any hints how to increase MM gain wil be most welcome!

Arne K

 

[analog_sa]

Reducing the 100ohm resistor R21 will help within limits. A lot of people have simulated the design so OLG must be well known. This will give you a hint of the max CLG before riaa gets affected. I am sure you can easily squeeze in an extra 10db.

 

[Cobra2]

Thanks!
Any guess how low I can go on R21?
+6-8dB would do the difference, I guess.

Arne K

 

[analog_sa]

The best answer would come from someone with a working simulation - a PM to Stefanoo may help. At +6db you should probably also raise the 220uF caps proportinately to the reduction in resistance if you are using them.